My arab pony, Wildey, is a chestnut with a wide blaze and one white sock. In winter, he is a normal chestnut colour, however in summer when he sheds out he gets black dapples. Well they look more like splitches than actual dapples. He gets them mostly on his bum, more pronounced on one side than the other, always in the same place/pattern. He also gets on small dapple on the side of his neck under his mane. He also has a very faint drosal stripe, but that is a darker chestnut, NOT black like his dapples/splotches.
So my question is; what could cause this? I have been reading about the sooty/smutty gene but it says that is is normally a darkening fo the dorsal stripe and topline of the horse, and he only has a darker chestnut dorsal stripe. The black areas are either side of his bum, and the one on his neck.
I'll try to find some photo's showing it.